August is the driest, golden heart of summer — fire-season haze possible in the east, hazelnuts and peppers filling the gardens, and shorebird migration building on the coast. The Perseids streak over the high desert and late-season alpine flowers linger.
Week by week in August
July 30 – August 5
- Coastal estuaries fill with southbound shorebirds, and sooty shearwaters stream by offshore in great flocks past Newport.
- Peak harvest — pick tomatoes, peppers, beans, and corn daily, and sow fall spinach, lettuce, and overwintering onions.
- In the high Cascade basins, fireweed blooms bottom to top and gentian and aster carry the fading meadows.
August 6–12
- The Perseid meteor shower peaks around August 12 — dozens of meteors an hour from Oregon's dark high desert, with the Oregon Star Party near its date.
- Tomatoes in every color, peppers, sweet corn, and melons reach peak, with late marionberries and Hood River peaches and plums.
- Woodland skippers reach their swarming peak in dry grass and gardens, and monarchs begin drifting toward the California coast.
August 13–19
- Pelagic trips out of Newport find albatross, petrels, and jaegers, while common nighthawks boom over the eastern towns at dusk.
- East of the Cascades, rabbitbrush begins its late-summer gold across the sage steppe, drawing the last pollinators.
- Water deeply against peak drought to prevent tomato cracking and blossom-end rot, and begin preserving the summer glut.
August 20–26
- East of the Cascades, the western juniper berries ripen blue, and aspen and cottonwoods show their first golden leaves by week's end.
- Italian prune plums begin and the first early apples and pears arrive alongside peak eggplant and melons.
- Raptor migration builds and the first returning waterfowl trickle south through Malheur and the valley.
August 27 – September 2
- Painted ladies and red admirals nectar heavily on the blooming rabbitbrush, the eastside's final butterfly pulse of summer.
- East of the Cascades, harvest fast — the high desert around Bend can see its first frost now; cover tender crops on clear cold nights.
- The Willamette Valley wine-grape harvest begins, with table grapes and fresh juice appearing at the stands.
Birds This Month
August is shorebird month on the Oregon coast. The estuaries — Bandon Marsh, the Necanicum, Bayocean, and Coos Bay — fill with southbound western and least sandpipers, dowitchers, dunlin, black-bellied and semipalmated plovers, whimbrels, and marbled godwits as fall migration accelerates. Offshore, sooty shearwaters stream by in great flocks, and pelagic trips out of Newport find albatross, petrels, and jaegers.
Inland, the breeding season closes — many songbirds fall silent and begin molting and dispersing. The Cascade meadows still hold rufous and calliope hummingbirds on the late flowers, Clark's nutcrackers caching whitebark pine seeds, and mountain bluebirds. Raptor migration begins to build, and common nighthawks boom over the eastern towns at dusk. The first returning waterfowl and warblers trickle south through Malheur and the valley. Western meadowlarks (state bird) still sing in the dry grasslands.
What's Blooming
August is the dry, late-summer bloom in Oregon, scaled to heat and drought. In the high Cascade meadows, the last flowers linger as the season fades — lupine, aster, fireweed blooming bottom to top, monkshood, gentian, and pearly everlasting — best in the cooler high basins of the Wallowas, Three Sisters, and Crater Lake rim. The lowland valley is golden and dry, with chicory, tansy, teasel, goldenrod, and the late tarweed on the dry prairies.
On the coast, the cool fog keeps seaside daisy, gumweed, yarrow, and headland flowers going, and the dune beach knotweed blooms. East of the Cascades, the sage steppe shows rabbitbrush beginning its late-summer gold, sulphur buckwheat, blazing star, and scarlet gilia on the dry slopes. Gardens overflow with dahlias, sunflowers, zinnias, and the famous Willamette Valley lavender finishing its run.
Garden This Month
August is peak harvest in the Oregon garden, the reward for the summer's watering. Pick tomatoes, peppers, cucumbers, summer squash, beans, sweet corn, and melons at their prime, and lift and cure onions and the rest of the garlic. Keep watering deeply — the Willamette Valley drought is at its peak and consistent moisture prevents tomato blossom-end rot and cracking.
This is also a key fall-planting month: sow spinach, lettuce, arugula, fall radishes, cilantro, and overwintering onions and brassicas early in the month so they establish before the cool, wet fall. Watch for spider mites, late blight in cool damp spells, and powdery mildew on squash. Begin preserving the glut. East of the Cascades, harvest fast and keep frost protection handy — the high desert around Bend can see its first frost as early as late August.
Zone 6b (Bend & high desert): harvest fast, because the first frost can arrive by late August or September at altitude. Cover tender crops on clear cold nights and harvest tomatoes as they color to finish indoors.
Zone 8a (Willamette Valley): peak harvest. Pick tomatoes, peppers, beans, corn, and squash daily, water deeply in the dry heat, and keep sowing fall and overwintering crops — spinach, lettuce, cilantro, and overwintering onions — for autumn and winter.
Zone 8b (southwest valleys & coast): the warm interior valleys ripen melons and peppers; keep harvesting and watering. On the cool coast, sow fall brassicas and greens that thrive in the mild autumn ahead.
What's at the Farmers Market
August markets reach peak summer abundance. The first hazelnuts are still months off, but the stands overflow with tomatoes in every color, peppers, sweet corn, green beans, cucumbers, summer squash, eggplant, and melons. The fruit is glorious: peak blueberries, late marionberries and blackberries, Hood River peaches, nectarines, plums, and the first early apples and pears.
Flower stalls blaze with dahlias, sunflowers, and zinnias, and dried lavender from the valley farms fills the air. Choose blueberries with their silvery bloom intact and refrigerate dry and unwashed; pick tomatoes heavy and fragrant and keep them at room temperature, never the cold fridge, which dulls their flavor. Buy peaches firm-but-yielding and let them finish ripening on the counter. The Hood River fruit stands and valley markets are at their richest now.
Night Sky This Month
August is the marquee stargazing month in Oregon — warm dry nights and the year's best Milky Way meet the famous Oregon Star Party, held under the pristine skies of the central Oregon high desert near Indian Trail Spring. Pine Mountain Observatory east of Bend runs full weekend programs, and the Oregon Outback International Dark Sky Sanctuary near Lakeview and Prineville Reservoir State Park are at their summer best.
The Perseid meteor shower peaks around August 12 — one of the year's most reliable showers, with dozens of meteors an hour from a dark site, radiating from Perseus rising in the northeast after midnight. The summer Milky Way blazes overhead, its core in Sagittarius and Scorpius packed with star clouds, nebulae, and globular clusters. The Summer Triangle rides the zenith. There is no finer month to lie back under Oregon's dark desert sky; the printable Oregon night-sky guide gives this year's planet positions and exact Perseid peak dates.
Butterflies & Pollinators
August keeps Oregon's butterflies abundant, shifting toward late-summer species. In the lowlands, woodland skippers reach their swarming peak in dry grass and gardens, painted ladies and West Coast ladies nectar on every flower, and western tiger swallowtails, Lorquin's admirals, and California sisters hold on. The summer great spangled fritillaries linger in moist meadows.
Monarchs from Oregon's western population begin to drift toward their California overwintering sites, and the last summer caterpillars finish on the milkweed. The high Cascade meadows still hold parnassians, late fritillaries, and alpine blues on the fading flowers. East of the Cascades, the blooming rabbitbrush and buckwheat draw coppers, hairstreaks, blues, and the late Oregon swallowtails (the state insect). Leave milkweed and seed heads standing to support the season's last broods and the migrating monarchs.
Trees This Month
August holds Oregon's forests in dusty, drought-stressed late-summer green, with the first hint of fall in the air at the end of the month. The conifers — the state tree Douglas-fir, grand fir, western hemlock, and ponderosa pine — are dormant in growth, conserving moisture through the dry season; some shed older interior needles. The eastside ponderosa bark is at its most fragrant in the heat.
The forest fruit ripens fully: the Cascade blue huckleberries peak now, a famous late-summer harvest in the high country, and cascara, elderberry, and Pacific dogwood set their colorful fruit. The Pacific madrone berries redden, and the Oregon white oak acorns swell on the valley savanna. East of the Cascades, the western juniper berries ripen blue, and the quaking aspen and streamside cottonwoods show the first golden leaves by month's end — the earliest signal of the long Oregon autumn to come.
Weather & Daylight
Across Oregon, a typical August day averages a high near 82°F and a low near 50°F, with about 0.5 inches of precipitation — statewide averages from the 1991–2020 U.S. climate normals.
Still summer-hot at 82 degrees by day with warm 50-degree nights, and dry conditions carrying over from July.
| Average high | 82°F |
|---|---|
| Average low | 50°F |
| Precipitation | 0.5 in |
| Sunrise (mid-month) | 6:10 PT |
| Sunset (mid-month) | 20:15 PT |
Figures are statewide averages over the 1991–2020 U.S. climate normals; local conditions vary with elevation and distance from the coast. Sunrise and sunset are computed for a midstate point on the 15th (PT).
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Same month elsewhere: August in Pennsylvania · August in Rhode Island · August in South Carolina